Movie/Game Props and Costumes

I have just printed my second helmet and am having issues getting them the right size . i know i have a large head but ! is there a way of getting these to fit , without printing half a dozen ? many thanks

So, I'm a Huge Sultan Abdulhamid Han fan and a Ahmet cellatin pasha fan(They are famous ottoman people)
I'm trying to make their swords and i decided upon 3d printing the handle, Except i'm bad at designing stuff like sword handles:
Here are the images of both swords, If someone could please design both handles that would be great.

Just finished my T-800 Terminator (well...95% finished)

So surprised to not see a plethora of cobra viper helmets and armor

This is going to be a complete Documentary for an "Iron Man Mark.45 Suit" build. I plan on building every part using parts provided by DaDave, Jace1969 and joshuarkendrick (See https://www.thingiverse.com/thing:1779274 https://www.thingiverse.com/thing:2328895 and https://www.thingiverse.com/thing:1515871 respectively) mixing small pieces here and there for build and usage comfort.

As of right now I have the full front chest built (see attached photo "MK45 Chest"). I am working on the Helmet now and should have that to show in a short time.

Back to the format of the Documentary... I will be uploading photos of all the parts I print as they come out and are pieced together. When I start priming, sanding, and painting I will also upload photos and information on that. I hope I can help other people looking to start big projects like this one in the future. This is a place you are more than welcome to ask questions. I will answer to the best of my ability. I will not only post the wins, but the problems I cam across as well, to better help other people in the future taking on prints like this. All of you are also welcome to comment and even suggest different settings, or anything you think will help.

I am using both a CR-10 Printer and a cheap Prusa i3 Clone. The CR-10 is doing most of the heavy lifting and the Clone is doing some minor pick-up here and there. My print settings are listed in the attachment "Print Settings" and I am using "Ultimaker Cura".

Anyway, on to the first part. As I was saying attached is a photo of the Full Front Chest. Each of these four pieces took on the low end of 8 hours to the high end of 10 hours to print. The files provided by joshuarkendrick were too small to print at 100% (learned that after the first helmet print (hence a new helmet print "after" the chest) so I bumped it up to 110% and that "seems" to be a good size for me (and I am of average build). Putting the four pieces together was not as hard as I thought, but one piece I printed did have an "issue" lifting off the build plate in one corner. That is ok though, a small amount of putty and some sanding will fix that.